Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b75391b6093fa7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 00:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ce6de55d5db86bef0baf269d61957f56 SHA-1: 65ebac3872ca3c3baee62edeab3ddb63f684ff3f SHA-256: 09b75391b6093fa761c94b4cb63515cc39da04ff81a906f581c52d25f7ce0934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://colegiosantarosa.com/uploads/imagem/file/96174679426.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gcgisl7fmckhlqjafiqj68ijhi/21824438163.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/12151216771.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/bapamawerevi.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/43785999949.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/bi931sgnvohd2pl29mv5nerpt7/67845757633.pdfIn PDF document text
    • http://fittbikese.hu/files/file/93647063219.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/jumosovux.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/342239ab211d014e43276a8d936879e8/fijipakodalijak.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c689324af1---kowozunenonaf.pdfIn PDF document text
    • https://rm-parketi.si/uploads/6984427033.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7b05e523a6ada53d7a02b645967a5516/71940086784.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/wuzodofenojo.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/16307574837.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/katojiponel.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/38083889997.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/rafimawuzufuzebozemi.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/nalaleborodorowozabofabe.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/fd846be5947de4fd255c8f2b05d9460b/12929560056.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/20038576275.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/pabavujivubumunos.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/75431596593.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bc83ca75---91514161983.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/xazuwidom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=first+aid+kit+guide+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 17000 bytes
SHA-256: 639c597be2c6d45e3b4c9ad8438ced3351235c0b68f2478957508feb90b0fa03
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 10572 bytes
SHA-256: 591c4a3a1a8b14a5c7109eedb7c0106302a8a8d61dda24494b211107f90397a2
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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